Make elements wrap in new ScrollView

First time trying to do some serious UI, I just want to learn. How can make those elements wrap back to a new line inside the scroll view in the UIToolkit?

I found why. Not really convenient. You have to access the #unity-content-container via code, or in debug mode, change its width to 100%, and its flex-wrap to Wrap. Weird that all of that isnt made by default.